/Engine/Plugins/Online/OnlineFramework/Source/Lobby/Public/LobbyBeaconClient.h
Delegate called when a player joins the lobby
typedef TBaseDelegate_TwoParams< void, const [FText](API\Runtime\Core\Internationalization\FText) &, const [FUniqueNetIdRepl](API\Runtime\Engine\GameFramework\FUniqueNetIdRepl) & > FOnLobbyPlayerJoined